Thread controlling mechanism for sewing machines



THREAD CONTROLLING MECHANISM FOR SEWING MACHINES Filed Dec. 28 1929 3 Sheets-Sheet 1 2mm]! w Feb. 28, 1933- c. F. RUBEL ET AL THREAD CONTROLLING MECHANISM FOR SEWING MACHINES 5 Sheets-Sheet 2 Filed'Dec. 28 1929 Feb. 28, 1933.

c. F. RUBEL ET AL THREAD CONTROLLING MECHANISM FOR SEWING MACHINES 5 Sheets-Sheet 3 Filed Dec. 26 1929 Patented Feb. 28, 1933 UNITED STATES PATENT: OFFICE CHARLES F. B-UBEL AND FREDERICK. F. ZEIER, OF CHICAGO, ILLINOIS, ASSIGNORS 'IO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION rrrmors "THREAD CONTROLLING MECHANISM roasnwme MACHINES Application filed December 26, 1929. Serial No.'4i16,611.=

The invention relates to newt and useful improvements in a thread controllingmechanism for sewing machines, and more particularly to a thread controlling mechanism for the-thread carrying looper of a sewing. machine. l

In an application filed by Norman V. Christensen, Charles F. Rubel and Freder ck F. Zeier, August 2, 1928, Serial No. 297,059, a rotating thread controlling member is shown, described andv claimed, whereinv the threads pass acrossthecontroller in parallel planes at right angles to the axisofrotation of the thread controlling member, and wherein said member is provided with means for taking up and casting off the threads during the rotation of the thread controlling element. In a controller of this type it is very important that the thread guides be disposed in a predetermined set position relatlve to said controlling element. v

An object of the'invention is to provide a thread controller of the above type wherein the thread guides are rigidly attached to a supporting means, which supporting means in turn is mounted so that the thread guides may be simultaneously moved to a position where they are accessible for threading and then returnedfto a fixed predetermined position relative to; the thread controlling member. f 1 v i In. the drawings t a. t T Figure 1 is a plan viewof the parts he neath the; work. support showing the looper operating mechanism. and the improved thread controller, I

Fig. 2 is aview partlyinfront elevation and partly in section of the parts shown in Fig.1." v. 7H Fig. 3 is a sectionalview on the line 3--3 of Fig. 1, the thread controller being broken away to show the supportfo'r the thread guides. 1

Fig. 4 is a perspective viewofthe thread guidesand' the supporting means therefor, one of the guides being se paratedfrom its support to show more clearly the structure thereof. Y

The invention is directed to the means for supporting the thread guides used in connection a rotating thread controllingelement so as to direct'the threads in separate planes atright angles to the axisof rotation of said controlling element into contact with. the peripheral surface of the controlling element. These thread guides are mounted so that they may be simultaneously turned to a 1 position which renders them accessible for threading. Said thread guides are rigidly attached to a suppor-tingshaftmounted in a suitable bracket and said shaft maybe manually turned so as to raise the thread guides to a position where they are accessible for threading. A spring is provided which holds said shaft with the thread guides in raised position. When the thread guides, are low, ered to operative position relative to the thread controlling member there is a stop means which limits. their movement and a springfor yieldingly holding the support for the thread guides against the stop means and thus holding said thread guides in proper cooperative position relative to the thread controlling member.

Referring more in detail to the drawings, the invention'is shown as applied to a sewing machine which includes a supporting bed" 1 on whichthe main operating shaft 2 is mounted for rotation. As shown in the drawings, there are two loopers and 4.- These loopers are mounted on. a carrier 5 which, is oscilvlated by means ofa link ficonnected to an arm carried by a rock lever 7 which in turn is jecting portion which engages the threads for taking, up the same. This radially'projecting portion is slotted so that the threads when moved laterally will'be cast from the projecting-portion into the slots and thus slack given quickly to the threads. The means for casting the thread 0H from the shoulder is mounted on and movable with the thread controlling element. This type of rotating thread controlling element which takes up and casts off the threads forms no part of the present invention per se, but is shown, de-

scribed and claimed in the application above referred'tOJ i Associated with this thread controlling element are thread guides for the threads. The

threads pass from the supply through a fixed The threads after passing the thread guiding-means 16 pass through thread eyes 17 and 18 respectively-formed in an arm 19. They then-cross the thread controlling element in plan'esspaced from each other and at right angles to the axis 'of rotation of the thread controlling element. The threads pass throughthread guides 20 and 21 respectively in the arm 22 at the other side of the thread controlling element and from this point the threads are led to the loopers.

, Mounted on the bed plate 1 ofthe machine is a supporting bracket 27. Said bracket has two bearings 28, 28 and mounted in said bearings' is ashaft 29. A block'30 is secured to the shaft and disposed between the bearings 28, 28 and this holds the shaft from endwise movement. Mounted'on the end of the shaft which projects from the bearings is a supporting block 31. The arm 19 is bolted to this block 31by' screws 32, 32 passing through slots 33, 33 in the bracket base 34; with which thearm 19 is integrally formed. These slots arei elong'ated so that the arm may be raised and lowered on the support.

. The arm 22 is provided with an integral bracket base portion 35. This bracket portion issecured to the block by means of a screw 36 and a post 37 which functions as a screw. The, post and screw pass through elongated slots in the base so that the arm 22 may be raised and lowered on its supporting block.

The block 30 i's'provided with an inclined face38 and also an inclined face 39, which faces intersect to form a shoulder 40. A leaf spring 41 secured to the bracket 27 bears against this shoulder 40. I When the arm 22 is movedto the position shown in full lines in Figs. 2 and 4 the spring bearing against the shoulder will force said arm in a downward direction until it'strikes the bracket 27 which the dotted line position in'Fig';;2,. and also,

serves as a handle formanually loweringthese arms to position where they cooperate with the thread controlling element. The arms are simultaneously raised and simultaneously to the same shaft 29, and therefore, in both their raised and lowered positionswillremain in a fixed position relative to'each other.

If there is any shifting of the set position of one, the other'also will be shifted'to the same extent." This insures thatthe threads when the thread guides arein normal "position for cooperation with the thread controlling element will be passed in'parallel planes with exactness across the thread controlling element; When the thread arms are raised, the'thread guides are then positioned so that they may be readily threaded and after they are threaded then they are simultaneously lowered, as noted, and the threads broughtiinto engagement with the threadcontrolling element. l g

It is'obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims.

jI-Iaving fully described our invention, what we claim as new and desire to secure by Letters Patent, is i 1. A thread controlling mechanism for sewing machines including a rotating shaft, a thread controlling element mounted on said shaft for rotation therewith and] having means 'adapted'to engage'the thread for controlling'thesame, thread guideslocated at lowered. The arms'areboth rigidly attached opposite sides of said shaft and said thread controlling element and disposed so that: the thread passing between 'saidfguid'es is led into" engagement with the peripheral surface thereof, a shaft extending in a direction at right angles to a plane containing the axis of the shaft supporting said thread controlling element on which said thread guides are opposite sides of said shaft and said thread controlling element and disposed so that the thread passing between said guides is led into engagement with the peripheral surface thereof, a shaft extending in a direction at right angles to a plane containing the axis of the shaft supporting said thread controlling element on which said thread guides are mounted, said thread guides being disposed at one side of the axis of the shaft supporting the same whereby when said shaft is rotated said thread guides are moved away from the thread controlling element and rendered accessible for threading, yielding means connected to said shaft for holding the thread guides in normal position for cooperation with the thread controlling element and means carried by said shaft for turning the same. p

3. A thread controlling mechanism for sewing machines including a rotating shaft, a thread controlling element mounted on said shaft for rotation therewith and having means adapted to engage the thread for controlling the same, thread guides located at opposite sides of said shaft and said thread controlling element and disposed so that the thread passing between said guides is led into engagement with the peripheral surface thereof, a shaft extending in a direction at right angles to a plane containing the axis of the shaft supporting said thread control-,

ling element on which said thread guides are mounted, arms attached to the shaft and extending at right angles thereto for carrying the respective thread guides, said arms being independently shiftable on said supporting shaft, yielding means for holding said shaft in a set position with said thread guides in normal thread guiding position and means attached to the shaft whereby it may be turned to move said thread guides to position the same for threading. I

In testimony whereof, We aflix our signatures.

CHARLES F. RUBEL.

FREDERICK F. ZEIER. 

